This huge Experimental Aircraft Association festival includes air shows, fireworks, big-name concerts, children's activities, workshops, exhibits and rides in historic aircraft.
Reserve lodgings early; it fills rooms within a 60-mile radius.
Professional musicians, many of them world-famous, offer free classical concerts in Millennium Park's beautiful Pritzker Pavilion.
This year, seating is at 25 percent capacity and still is free but must be reserved. Tickets will be available at 10 a.m. Mondays before the event.